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Income Taxes (Details 3) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Reconciliation of gross unrecognized tax benefits |  |  |
Balance as of beginning of fiscal year | $ 40.0 | $ 26.7 | $ 41.7
Additions for tax positions of the current year | 6.7 | 11.2 | 28.5
Additions for tax positions of prior years | 0.8 | 4.2 | 12.2
Reductions for tax positions of prior years | (0.4) | (1.8) | (0.5)
Settlements with tax authorities | (1.2) | 0.0 | (55.0)
Expiration of the statute of limitations | (6.0) | (0.3) | (0.2)
Balance as of end of fiscal year | $ 39.9 | $ 40.0 | $ 26.7

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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